Climate 3 is essentially the opposite of Climate 2. It identifies the consequences if the baseline of 20°C (68°F) occurs for 50% of the time and the remaining 50% is at a higher temperature of 25°C (77°F). It shows that the annual server failures would increase by 12% (Net X-Factor of 1.12) based on keeping everything else constant except inlet temperature.

Climate 4 is a hybrid example with a

disproportionate amount of the operational hours being below 20°C (68°F). It shows that the annual server failures would be reduced by 4% (X-Factor of 0.96) based on keeping everything constant except inlet temperature.

NET X-FACTOR: US &#38; GLOBAL CITIES The Net X-Factor is somewhat unintuitive but essentially identifies that the key to temperature related server failures is the total operational hours at each temperature. Figure 4a (page 14) shows the Net X-Factors for US cities and Figure 4b (page 15) Net X-Factor for global cities using

historical climate data from ASHRAE’s Weather Data Viewer software. These two figures highlight the opportunity to use full time economizers with a minimal increase in server failures or, in some cities, even a reduction in server failures.

In Figure 4a, there are 15 US cities that combine for a combined Net X-Factor average of 1.02. In Figure 4b there are 23 global cities that combine for a combined Net X-Factor average of 1.00. The Net X-Factor average for the 38 cities listed in Figure 4a and 4b was very close to 1 (1.02) which means an annual operating temperature